CN106452583B - The device and method of visible light parallel transmission video - Google Patents
The device and method of visible light parallel transmission video Download PDFInfo
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- CN106452583B CN106452583B CN201610822881.4A CN201610822881A CN106452583B CN 106452583 B CN106452583 B CN 106452583B CN 201610822881 A CN201610822881 A CN 201610822881A CN 106452583 B CN106452583 B CN 106452583B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
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Abstract
The device and method of visible light parallel transmission video belongs to wireless video communication technical field.The prior art not yet realizes the real-time of field video signal, ultrahigh speed and undistorted wireless transmission.The present invention utilizes the characteristics of camera multidiameter delay output digital video signal, pass through video acquisition and pixel splicing module, several LED and several photodetectors, pixel separation module etc., the Wireless transceiver vision signal in a manner of multidiameter delay, multiple-input multiple-output, there is no data to transmit bottleneck, any digital video compression processing is not needed, the integrality for guaranteeing vision signal, avoids being distorted.As a kind of visible light communication, it is seen that optical channel is mutually indepedent, is not in the cross-interference issue of radio communication therefore.Meanwhile compared with radio communication, electromagnetic radiation is not present in the present invention, and then not will cause human injury, will not interfere the work of other electromagnetic susceptible devices.
Description
Technical field
The present invention relates to a kind of device and methods of visible light parallel transmission video, belong to wireless video communication technology neck
Domain.
Background technique
The ultra high-definitions such as 2K, 4K, ultrahigh resolution video technique have higher requirement to bandwidth, and radio communication is not able to satisfy
This requirement.Compared with radio communication, it is seen that optic communication due to common LED light source can High Speed Modulation, it is logical to have high-speed figure
Letter basis；Nowadays the message transmission rate of visible light communication has reached 3.4Gbit/s, and the pole of the Wi-Fi as radio communication
Limiting message transmission rate is only 700Mbit/s, thus, it is seen that optic communication is more suitable for transmission of video.However, the prior art not yet will
The high data rate advantage of visible light communication sufficiently developed.For example, application No. is 201310582529.4, it is entitled
One Chinese patent application of " visible light video communication system and method based on FPGA " discloses a scheme, program benefit
Vision signal is coded and decoded with FPGA, using LED light be wirelessly transferred vision signal, realize vision signal two PC machine it
Between Wireless transceiver, but, the program only wireless transmission link utilize visible light communication, therefore, message transmission rate is not
It can improve comprehensively, only 10Mbps.In addition, vision signal to be sent is converted video stream signal by the program, actually this
It is the processing to raw video signal, will lead to the loss of raw video signal, the transmission of vision signal fails to reach both superelevation
It is fast and undistorted.Further more, the program as it is conceived, only realize Wireless transceiver of the vision signal between two PC machine, and
It is not real-time transmission live video.
Summary of the invention
In order to realize the real-time of field video signal, ultrahigh speed and undistorted wireless transmission, we have invented a kind of visible
The device and method of light parallel transmission video.
In the device of the visible light parallel transmission video of the present invention, in transmitting terminal, modulation module, LED drive device,
LED is sequentially connected；In receiving end, photodetector is connect with demodulation module；It is characterized in that, as shown in Figure 1, video acquisition and
Pixel splicing module is connect with camera and the modulation module respectively；Several LED are driven by a LED multi-path driving device
Dynamic, several described LED respectively have respective visible light emission wavelength, several described LED light directions are consistent；Several photoelectricity
Detector photosurface and several described LED light directions are opposite one by one, each preposition transmission peak wavelength of photodetector etc.
In the optical filtering of LED emission wavelength on the other side；Several photodetectors are connect with the same demodulation module respectively；Pixel
Point separation module is connect with the demodulation module and storage unit and display unit respectively.
Digital video signal is modulated to LED drive signal by the method for the visible light parallel transmission video of the present invention, is passed through
LED drive device drive LED shine, this shine electric signal is received and converted to by photodetector after, demodulation be reduced to number
Vision signal；It is characterized in that, acquisition digital video signal is shot with video-corder at camera scene, the CMOS chip in camera is when each
Clock period multidiameter delay synchronism output multidigit binary system differential digital vision signal；In video acquisition and pixel splicing module
Multidigit binary system differential digital vision signal described in FPGA multi pass acquisition simultaneously successively keeps in video acquisition and pixel splicing mould
In synchronous DRAM (SDRAM) in block, according to the successive each of each road storage from synchronous DRAM
1 pair of adjacent pixel is extracted, and is stored in the shift register in FPGA, shift register is by the identical bits of each pair of adjacent pixel in each road
Spliced, as shown in Fig. 2, each road respectively obtains two binary sequence splicing signals, and does synchronization process；By modulation module tune
It makes each Lu Erwei binary sequence splicing signal and obtains modulated signal, as shown in Fig. 2, Fig. 5；In LED drive device, such as
Shown in Fig. 3, transfers to preequalization module to do pre-equalization process respectively modulated signal described in multichannel, add direct current biasing；By by multichannel
Modulated signal after pre-equalization process is loaded on the different LED of multiple emission wavelengths and emits the visible optical carrier of multichannel；
As shown in figure 4, each photodetector receives and converts the visible optical carrier in every road as electric signal, filters and amplify；It is described
Electric signal is demodulated into binary signal in demodulation module, as shown in figs. 4 and 6；It later will be described by pixel separation module
The adjacent pixel transmitted while in binary signal separates, and obtains digital video signal；Later by memory module or display
Module stores or shows the digital video signal.
As it can be seen that the present invention its have technical effect that, using camera simultaneously and concurrently output the characteristics of, though video believe
The emission process or receive process of number wireless transmission, whole multichannel carry out, and there is no data to transmit bottleneck.In emission process,
The visible optical carrier of multichannel is issued using multiple and different wavelength LED, each LED has 200Mbps transmission rate, if 8 tunnels
It sends, can be obtained the up to traffic rate of 1.6Gbps, it being capable of undistorted transmission ultra high-definition vision signal.In receive process, by
The corresponding visible optical carrier of multichannel for receiving multiple LED and issuing of multiple photodetectors, realizes the multiple of digital video signal
It is receive more.In the present invention, any digital video compression processing is not needed, guarantees the integrality of vision signal, avoids being distorted.
As a kind of visible light communication, it is seen that optical channel is mutually indepedent, is not in the cross-interference issue of radio communication therefore.Meanwhile with
Radio communication is compared, and electromagnetic radiation is not present in the present invention, and then not will cause human injury, will not interfere other electromagnetic susceptibilities
The work of device.
Detailed description of the invention
Fig. 1 is the apparatus structure block diagram of the visible light parallel transmission video of the present invention, which is used as Figure of abstract simultaneously.Figure
2 be method video acquisition and the pixel splicing of the visible light parallel transmission video of the present invention and modulation step block diagram.Fig. 3 is
The method LED of the visible light parallel transmission video of the present invention drives and LED light emitting step block diagram.Fig. 4 is the visible of the present invention
Method photodetection, demodulation, pixel separation and the storage of light parallel transmission video and display step block diagram.Fig. 5, Fig. 6 points
Not Wei the present invention visible light parallel transmission video method ACO-OFDM modulation, demodulation step block diagram.
Specific embodiment
In the device of the visible light parallel transmission video of the present invention, in transmitting terminal, modulation module, LED drive device,
LED is sequentially connected；In receiving end, photodetector is connect with demodulation module.As shown in Figure 1, video acquisition and pixel splicing
Module is connect with camera and the modulation module respectively, and video acquisition and pixel splicing module include a field-programmable
Gate array (FPGA) such as matches Sentos Zynq-7000 Series FPGA and a synchronous DRAM (SDRAM), such as
DDR3.Several LED, such as 8 or 10, are driven by a LED multi-path driving device, several described LED respectively have respectively
Visible light emission wavelength, several described LED light directions are consistent.The LED drive device includes a preequalization module,
Such as digital filter and a DC bias circuit.Several photodetectors, such as 8 or 10, their photosurface
Opposite one by one with several described LED light directions, each preposition transmission peak wavelength of photodetector is equal on the other side
The optical filtering of LED emission wavelength.Several photodetectors are connect with the same demodulation module respectively.Pixel separation module point
It is not connect with the demodulation module and storage unit and display unit.
Acquisition digital video signal is shot with video-corder at camera scene, the CMOS chip in camera each clock cycle multichannel simultaneously
Row synchronism output multidigit binary system differential digital vision signal.FPGA multi pass acquisition in video acquisition and pixel splicing module
The multidigit binary system differential digital vision signal and successively keep in video acquisition with it is synchronous dynamic in pixel splicing module
In state random access memory (SDRAM), the multichannel is 8 tunnels or 10 tunnels, and the synchronous DRAM uses DDR3,
DDR3 has 8 or the every frame image of digital video is temporarily stored in some BANK by 16 BANK (storage inside module), DDR3,
The image of different moments is written with ping pong scheme into some BANK by FPGA, while the figure of different moments is read from some BANK
Picture, i.e., the 1 pair of adjacent pixel of successive each extraction stored from synchronous DRAM according to each road, and be stored in FPGA
Shift register, shift register splice the identical bits of each pair of adjacent pixel in each road, as shown in Fig. 2, each road respectively obtains
Two binary sequence splicing signals, guarantee the sequencing of pixel, spliced data are 00,01,10,11 4 kind of state it
One.It since transmission rate is very fast, needs to do synchronization process to two binary sequence splicing signals before modulation, to guarantee
Each road signal synchronism output, and then prevent metastable state phenomenon from occurring.Each Lu Erwei binary sequence is modulated by modulation module
Splicing signal obtains modulated signal, and the four level modes that are modulated to modulate perhaps ACO-OFDM modulation such as Fig. 2 Fig. 5 institute
Show, the modulated signal is four level signals, including 0E, 1E, 2E, 3E or ACO-OFDM signal, the ACO-OFDM tune
Bipolar signal in OFDM is become unipolarity positive signal by system, to improve traffic rate.In LED drive device, such as Fig. 3 institute
Show, transfers to preequalization module to do pre-equalization process respectively modulated signal described in multichannel, the preequalization module is using number filter
Four level signals are made the modulation bandwidth of LED reach 100MHz by wave device by quadravalence FIR (limited unit impulse response filtering),
By testing the practical traffic rate per LED all the way with 200Mbps of so processing, up to 1.6Gbps had both been may be implemented in 8 tunnels
The undistorted transmission of any ultra high-definition vision signal may be implemented in traffic rate.Add direct current biasing, then LED is driven to make letter
Number there is higher signal-to-noise ratio in the channel.It is different by the modulated signal after multichannel pre-equalization process is loaded into multiple emission wavelengths
LED on and emit the visible optical carrier of multichannel.As shown in figure 4, each photodetector receives and converts every road visible light
Carrier signal is electric signal, filters and amplifies, parallel output is to demodulation module later.The electric signal is solved in demodulation module
It is adjusted to binary signal, it is as shown in figs. 4 and 6, described to be demodulated into more level judgement demodulation or ACO-OFDM demodulation.Pixel
Separation module uses FPGA, and the binary signal after demodulation is sent into the FPGA and carries out data separating, is stored in the FPGA later
In built-in FIFO；The binary signal that parallel output is read from the FIFO, passes while by the binary signal
Defeated adjacent pixel separates, and obtains digital video signal.Later the number is stored or shown by memory module or display module
Vision signal.
Claims (6)
1. a kind of device of visible light parallel transmission video, in transmitting terminal, modulation module, LED drive device, LED are sequentially connected；
In receiving end, photodetector is connect with demodulation module；It is characterized in that, video acquisition and pixel splicing module respectively with take the photograph
As head and the modulation module connect；Acquisition digital video signal is shot with video-corder at camera scene, and the CMOS chip in camera is every
A clock cycle multidiameter delay synchronism output multidigit binary system differential digital vision signal；Video acquisition and pixel splicing module
In FPGA multi pass acquisition described in multidigit binary system differential digital vision signal and successively keep in video acquisition and pixel and spell
In synchronous DRAM in connection module, according to successive each extraction of each road storage from synchronous DRAM
1 pair of adjacent pixel, and it is stored in the shift register in FPGA, shift register carries out the identical bits of each pair of each road adjacent pixel
Splicing, each road respectively obtains two binary sequence splicing signals, and does synchronization process；Each Lu Erwei is modulated by modulation module
Binary sequence splicing signal obtains modulated signal；Several LED are driven by a LED multi-path driving device, it is described several
LED respectively has respective visible light emission wavelength, several described LED light directions are consistent；Several photodetector photosurfaces
Opposite one by one with several described LED light directions, each preposition transmission peak wavelength of photodetector is equal on the other side
The optical filtering of LED emission wavelength；Several photodetectors are connect with the same demodulation module respectively；Pixel separation module point
It is not connect with the demodulation module and storage unit and display unit；Each photodetector receives and converts every road visible light and carries
Wave signal is electric signal, filters and amplifies；The electric signal is demodulated into binary signal in demodulation module；Later by pixel
The adjacent pixel transmitted while point separation module is by the binary signal separates, and obtains digital video signal.
2. the device of visible light parallel transmission video according to claim 1, which is characterized in that several described LED or
Several photodetectors of person are 8 or 10.
3. the device of visible light parallel transmission video according to claim 1, which is characterized in that the LED drive device
Include a preequalization module and a DC bias circuit.
4. a kind of method of visible light parallel transmission video, is modulated to LED drive signal for digital video signal, is driven by LED
Dynamic device driving LED shines, this shines electric signal is received and converted to by photodetector after, demodulation is reduced to digital video letter
Number；It is characterized in that, acquisition digital video signal is shot with video-corder at camera scene, the CMOS chip in camera is in each clock cycle
Multidiameter delay synchronism output multidigit binary system differential digital vision signal；FPGA in video acquisition and pixel splicing module is more
Road acquires the multidigit binary system differential digital vision signal and successively keeps in video acquisition and pixel splicing module
In synchronous DRAM, according to 1 pair of adjacent picture of successive each extraction of each road storage from synchronous DRAM
Element, and it is stored in the shift register in FPGA, shift register splices the identical bits of each pair of adjacent pixel in each road, each road
Two binary sequence splicing signals are respectively obtained, and do synchronization process；Each Lu Erwei binary system sequence is modulated by modulation module
Column splicing signal obtains modulated signal；In LED drive device, preequalization module is transferred to do respectively modulated signal described in multichannel
Pre-equalization process adds direct current biasing；It is different by the modulated signal after multichannel pre-equalization process is loaded into multiple emission wavelengths
LED is upper and emits the visible optical carrier of multichannel；Each photodetector receives and converts the visible optical carrier in every road as electricity
Signal filters and amplifies；The electric signal is demodulated into binary signal in demodulation module；Later by pixel separation module
The adjacent pixel transmitted while by the binary signal separates, and obtains digital video signal；Later by memory module or
Person's display module stores or shows the digital video signal.
5. the method for visible light parallel transmission video according to claim 4, which is characterized in that the multichannel be 8 tunnels or
10 tunnel of person.
6. the method for visible light parallel transmission video according to claim 4, which is characterized in that described to be modulated to four level
Mode is modulated or ACO-OFDM modulation；It is described to be demodulated into more level judgement demodulation or ACO-OFDM demodulation.
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| CN107483114B (en) * | 2017-08-05 | 2019-06-04 | 深圳市光域物联科技有限公司 | Multichannel indicator light data parallel Transmission system and method |
| CN108337557B (en) * | 2018-02-11 | 2020-09-22 | 南昌大学 | Visible light multi-screen same-screen display device and method |
| CN111541957A (en) * | 2020-04-21 | 2020-08-14 | 武汉英飞光创科技有限公司 | Method for modifying default value of signal integrity register and optical module |
| CN114826402B (en) * | 2022-06-27 | 2022-09-13 | 深圳华创芯光科技有限公司 | Information interaction method, device, equipment and storage medium for visible light communication |
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| CN103986516A (en) * | 2014-05-30 | 2014-08-13 | 中国人民解放军信息工程大学 | Visible light communication system and method |
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| CN201709003U (en) * | 2010-07-06 | 2011-01-12 | 上海洪剑智能科技有限公司 | Modulated-light filtering device based on infrared LED |
| CN103986516A (en) * | 2014-05-30 | 2014-08-13 | 中国人民解放军信息工程大学 | Visible light communication system and method |
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